A random sample of 40 farming regions gave a sample mean $6.88 per 100 pounds. Assume the standard deviation is $1.90 per 100 pounds. Find a 90% confidence interval for population mean price per 100 pounds. What is the margin of error? Find the sample size for 90% confidence level with maximal error of 0.43 for the mean price per 100 pounds. A farm brings 15 tons of watermelon to market. Find 90% confidence interval for the population mean. What is the margin of error. 1 ton is 2000 pounds.

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